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Terminal blocks, headers, plugs and sockets form the cornerstone of multiple physical connection devices. The main purpose of using terminal blocks is to provide electrical connections between components and electronic systems. They play a pivotal role in connecting the electrical circuit being tested to the ground to ensure safety.

Terminal blocks are used in a variety of fields such as electrical and electronic engineering, HVAC, consumer electronics and general automotive applications. These can come in the form of terminal strips, PCB terminal blocks, and other screw-type and lever-type block forms. The type of terminal block chosen is always dependent on the specific application and its requirements.

The key components of a terminal block are the contact strips, spring clips, and plugs. The contact strips are made of copper or nickel-plated steel. These strips provide electrical contact between two points. The spring clips are made of metal or plastic, and they provide mechanical connection between two points. The plugs are used to connect the contact strips. They can be inserted in the contact strips to form a series of electrical contacts and to secure the connection.

When it comes to the working principle of terminal blocks, they are designed to make electrical connections with very low contact resistance. This is achieved by the physical contact between the spring clip and the contact strip. The contact resistance of the connection formed by the plug and the contact strip is minuscule and therefore, it lowers the contact resistance of the entire connection.

In summary, terminal blocks, headers, plugs and sockets form a major component in many electrical connection systems. Their purpose is to provide electrical connections between components and electronics systems. They also play an important role in connecting a circuit to the ground and provide a low-resistance connection between two points. They are used in various fields such as electrical and electronic engineering, HVAC, consumer electronics and general automotive applications.